The Iowa Air National Guard’s 132nd Fighter wing in Des Moines has been selected as one of the units to continue homeland defense missions. Colonel Robert King is the spokesman for the guard.He says the North American Aerospace Defense Command has assigned sectors of responsibility to fighter units around the country. The responsibility for the 132nd’s F-16 fighters begins tomorrow (Saturday).The fighters will be on alert for short-notice 24-hour-a-day responses to assignments from NORAD. King says this is part of formalizing sectors so all areas of the country can be quickly covered if needed.King says this is not in response to any specific threat, it’s simply the ongoing response following the attacks of September 11th. The fighter jets could be scrambled to shoot down airliners that pose a threat in the Midwest.